Here’s a confidence-builder: All 141 pas sengers and crew members aboard a JetBlue flight about to depart JFK last weekend had to be evacuated because Transportation Security Administration screeners missed three box-cutters stashed in a passenger’s carry-on bag.

As The Post’s Philip Messing reported, Jersey City factory worker Eusebio Peraltalajara boarded the plane with the razors, which he’d stowed in a carry-on after work and then forgot about.

TSA agents never noticed them.

Indeed, the razors were only discovered when they fell to the floor after a flight attendant asked him to stow his bag in the overhead compartment.

The attendant immediately raised an alarm, prompting a full terrorist alert.

But why did the TSA agents miss them in the first place?

Were they too busy checking the see-through scanners for a few salacious glimpses of “naked” passengers?

Maybe they were simply asleep.

Either way, it was an inexcusable lapse in security — coming as the FBI continues to uncover terrorist networks in this country eager to repeat 9/11.

A TSA spokeswoman insisted that passengers on the flight were never at risk.